參數(shù)資料
型號： M44C890-H
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Low-Current Microcontroller for Wireless Communication
中文描述： 4-BIT, EEPROM, MICROCONTROLLER, PDSO20
封裝： SSO-20
文件頁數(shù)： 21/63頁
文件大?。?/td> 503K
代理商： M44C890-H
M44C890
M44C090
Rev.A4, 14-Dec-01
21 (63)
3.2.1
Bidirectional Port 2
This, and all other bidirectional ports include a bitwise
programmable Control Register (P2CR), which enables
the individual programming of each port bit as input or
output. It also opens up the possibility of reading the pin
condition when in output mode. This is a useful feature
for self testing and for serial bus applications.
Port 2 however, has an increased drive capability and an
additional low resistance pull-up/-down transistor mask
option.
Master reset
Q
Q
BP2y
Mask options
*
*
P2DATy
S
P2CRy
I/O Bus
D
I/O Bus
I/O Bus
*
*
Switched
Pull-up
Pull-down
VDD
Static
Pull-up
*
(Data out)
(Direction)
S
D
*
VDD
Static
Pull-down
Switched
Figure 22. Bidirectional Port 2
Port 2 Data Register (P2DAT)
Primary register address:
’
2
’
hex
Bit 3 *
Bit 2
P2DAT2
Bit 1
P2DAT1
Bit 0
P2DAT0
áááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááááá
P2DAT
áááááááááááááááááááááááááááááááá
–
> LSB
Reset value: 1111b
Port 2 Control Register (P2CR)
Auxiliary register address:
’
2
’
hex
Bit 3
P2CR3
Bit 2
P2CR2
Bit 1
P2CR1
Bit 0
P2CR0
áááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááááá
P2CR
áááááááááááááááááááááááááááááááá
Value: 1111b means all pins in input mode
Code
3 2 1 0
x x x 0
x x 1 x
Reset value: 1111b
Function
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áááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááááá
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áááááááááááááááááááááááááááááááá
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